Fill in the response. 
- What are the different types of relics?
- They were allowed to remain in their often unidentified resting places in cemeteries and the catacombs of Rome, always outside the walls of the city, but martyriums began to be built over the site of the burial, and it was considered beneficial to the soul to be buried close to the remains of saints, several large "funerary halls" being built over the sites of martyr's graves, including Old Saint Peter's Basilica.
- Are there any other interesting aspects about this article?
- These were initially not regular churches, but "covered cemeteries" crammed with graves, and celebrating funerary and memorial services.
- Why were they built?
- According to the Catholic Encyclopedia it may have been thought that when the souls of the martyrs went to heaven on resurrection day they would be accompanied by those interred nearby, who would gain favour with God.
- What do you find to be the most interesting fact?
- 
The Second Council of Nicaea in 787 drew on the teaching of St. John Damascene that homage or respect is not really paid to an inanimate object, but to the holy person, and indeed the veneration of a holy person is itself honour paid to God.